Before I experienced my final retirement in 02, I was the Armory Sergeant at a Law Enforcement Academy. During those years we trained with Model 64s shooting primarily 158 grain lead hollow point +Ps. During my tenure we didn't experience any catastrophic problems on the range but did experience a cracked forcing cone now and then. We constantly rotated the revolvers with groups on the range and others in maintenance but all had many thousands of rounds through them. Of course we had some broken firing pins, had to replace some springs or a cylinder stop now and then but with the volume of shooting we were doing I considered these minor maintenance problems. Now, would I shoot +P in a post 50s K frame - frankly, yes.